MedDRA preferred term

Rales: adverse event reports recording this term

5,705 reports to FDA record it, 2004–2026; 0% of the database.

Read first · FDA's statement on these data

Adverse event reports submitted to FDA do not undergo extensive validation or verification. Therefore, a causal relationship cannot be established between product and reactions listed in a report. While a suspected relationship may exist, it is not medically validated and should not be the sole source of information for clinical decision making or other assumptions about the safety or efficacy of a product. Additionally, it is important to remember that adverse event reports represent a small percentage of total usage numbers of a product. Common products may have a higher number of adverse events due to the higher total number of people using the product. openFDA, FDA

FDA adds: "There is no certainty that the reported event (adverse event or medication error) was actually due to the product. FDA does not require that a causal relationship between a product and event be proven, and reports do not always contain enough detail to properly evaluate an event." The information in these reports "cannot be used to estimate the incidence of these events."

Do not rely on openFDA to make decisions regarding medical care. While we make every effort to ensure that data is accurate, you should assume all results are unvalidated.

Not medical advice. This site counts what was reported to FDA. Questions about a medicine or device belong with a pharmacist or clinician.

5,705
reports recording the term: 0% of all reports; 220
reports, 12 months to June 2026: 297 in the 12 months before; 93.8%
marked serious by the reporter: 57.4% across all reports; 15.5%
record death among outcomes, as reported: 9.1% across all reports

"Rales" is a MedDRA preferred term recorded in 5,705 adverse event reports received by FDA, 0% of the database, from January 2004 to June 2026. The term is chosen by whoever codes the report to match what the reporter described.

220 reports recorded it in the 12 months to June 2026, down 26% from 297 in the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Of reports recording this term, 93.8% are marked serious, 15.5% include death among the outcomes and 65.1% include hospitalisation, as reported.

The drugs listed most often as suspect products in those reports are Prednisone, Omalizumab and Xolair. That order mostly follows how many reports each drug has overall; the table also gives the term's share within each drug's own reports. FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event."

Reports by month, five years

FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases.

Drugs listed as suspect products in these reports

Drug	Class	Reports with this term	Share of the drug's own reports
Prednisone	Corticosteroid	341	0.2%
Omalizumab	Anti-IgE	307	2.9%
Xolair	Anti-IgE	264	0.4%
Furosemide	Loop diuretic	243	0.5%
Ipratropium bromide	Anticholinergic	243	2.9%
Bisoprolol	beta-Adrenergic blocker	234	1%
Albuterol sulfate	beta2-Adrenergic agonist	228	0.5%
Tiotropium bromide	Anticholinergic	208	0.3%
Albuterol	beta2-Adrenergic agonist	202	1.1%
Nitroglycerin	Nitrate vasodilator	202	3.3%
Singulair	Leukotriene receptor antagonist	195	1%
Mepolizumab	Interleukin-5 antagonist	191	1.2%
Acetaminophen	Nonsteroidal anti-inflammatory drug	190	0.2%
Rosuvastatin	HMG-CoA reductase inhibitor	177	0.9%
Metformin	Biguanide	163	0.2%
Pantoprazole	Proton pump inhibitor	149	0.3%
Nucala	Interleukin-5 antagonist	144	0.5%
Methotrexate	Folate analog metabolic inhibitor	139	0.1%
Azithromycin	Macrolide antimicrobial	135	0.8%
Zopiclone	—	133	0.9%
Aspirin	Nonsteroidal anti-inflammatory drug	130	0.2%
Budesonide	Corticosteroid	130	0.9%
Atorvastatin	—	129	0.3%
Digoxin	Cardiac glycoside	122	0.8%
Ramipril	Angiotensin converting enzyme inhibitor	118	0.3%

Drugs with a page on this site, ordered by the number of their reports recording this term. The last column is the term's share within that drug's own reports, against 0% across the whole database. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."

By pharmacologic class

Class	Reports with this term	Share of class reports	Median drug in class
Corticosteroid	1,454	0.2%	0%
Proton pump inhibitor	660	0.1%	0.1%
Anticholinergic	575	0.4%	0%
Anti-IgE	571	0.7%	0.4%
beta2-Adrenergic agonist	518	0.6%	0.1%
HMG-CoA reductase inhibitor	423	0.2%	0%
Leukotriene receptor antagonist	406	1.1%	1%
Nonsteroidal anti-inflammatory drug	401	0.1%	0%
beta-Adrenergic blocker	337	0.2%	0%
Angiotensin 2 receptor blocker	336	0.1%	0%

Classes ordered by count. Class shares follow the class's overall report volume as much as anything else.

Patients in these reports

Patient age

Under 20.8%45

2 to 111.6%90

12 to 171.1%61

18 to 449.8%557

45 to 6424%1,370

65 to 7419.4%1,108

75 and over21.4%1,219

Age not given22%1,255

Patient sex

Female52.9%3,019

Male40.1%2,286

Not given7%400

Grey bar: all 20,646,523 reports in the database. 31.3% of these reports give the United States as the country.

Questions about "Rales"

What does "Rales" mean in an adverse event report?

It is a MedDRA preferred term, the dictionary FDA uses to code what a reporter described. The report's own description is not published by openFDA and is not shown here.

How many reports record rales?

5,705 reports through June 2026 (0% of all reports), 220 of them in the latest 12 months.

Which drugs appear most often in these reports?

Prednisone (341), Omalizumab (307), Xolair (264), Furosemide (243) and Ipratropium bromide (243). Drugs with many reports overall lead almost every term's list. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."

Does a drug appearing here mean it was responsible for this reaction?

No. FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event."

I have this symptom. What should I do?

This site cannot assess anyone. A pharmacist or clinician can; for an emergency, call the local emergency number. Nothing on this page is medical advice.

Where this comes from. Counts are built from the openFDA Drug Adverse Event (FAERS) bulk export released 28 Sep 2026, which holds reports FDA received through 30 Jun 2026. Drug names are as reported, resolved to the brand or generic name on the FDA label where openFDA's harmonisation matched them; classes are the pharmacologic class (EPC) from the label and the National Drug Code Directory of 17 Sep 2026. Terms are pooled across spelling and capitalisation variants of one MedDRA preferred term. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.

Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.